George w



G. W. SCHOFI'ELD. REvoLvING FIRE-ARM.

'Patente-a July I31, 1877.

, UNITED STATES PATET y. .GEoRGE w. seEoFIELD, or UNITED STATES ARMY.

IMPROVEMENT iNmEv'oLviNe FIRE-ARMS.

'Specification forming-part of Letters Patent No. .193.6209 dated July 31, 1877 application filed March `24, 1877. f

To cLL whom 'it may concern:

Be it known that I, GEORGE W. ScnoFIEnD, of the United States Army, have invented a new and useful Improvement infltevolving Fire-Arms, of which the following is a specification, reference being had to the accom-` third, to provide an ejector-stud that will afford v areliable and efficient pivot for the cylinder;

- fourth, to provide means, through all of the foregoing, in combination, to prevent clogging of the revolving cylinder by fouling, rust, or gas, or by its losing its rear bearing, or by any or all of these agencies.

Figure 1 is a side elevation of a device embodying the elements of the invention. Fig. 2 is a central vertical longitudinal section of same. Fig. 3 is a detached view of the gascollar. Fig. 4 isV a front end view of the cylinder and ejector-stud. Fig. 5 is a detached side elevation of the base-pin, with gas-collar in position. v

In the accompanying' drawings, A represents the improved ejector-stud, to which is secured, at the rear e'nd, the ejector-head by means of a thread upon the stem of the stud.

This improved form of stud has its head or bearing made very broad, thus alfordio g a large surface, upon which the rear of the cylinder pivots, preventing its getting too much play by jamming the metal of the recoil-shield.

in which the st ud pivots by repeated discharges of the arm, the sides or opposite sides of the stud being out olf square, so that it may be removed by means of a wrench.

`The advantages secured by this invention may be stated to be as follows: Preventing the ejector-stud from losing its bearing, which, if lost, (which frequently happens in the methods now in use,) the cylinder yields tothe action of therhand when the hammer is retracted, causing the cylinder to tip, and thus bind on the base-pin at both ends.

'B represents the base-pin, which is cut away "for a portion of its length, providing thus the elongatedrecessl) to retain any fouling matter, and vto reduce the surface exposed to friction and rust. This also provides the annular shoulders E, the rear one of which serves as the Prear bearing for the cylinder, while the forward one receives the gas-collar hereinafter described, and which, when upon said shoulder, serves as the front, and a movable bearing for the cylinder. As any rusting of the. base pin is very apt to bind the cylinder it is made nickel-plated, and thus this invention affords a non-corrosive axis for the cylinder.

Theejector-steni H and spring l are contained within the hollow base-pin, when the pin is in place in the cavity L, which is bored out in the center of the cylinder, and provided at its frontend with the annular recess `M to receive the rear of the gas-collar-P. The an'- nular recess M is reamed to a larger diameter at its front end in order to give more space, in

whichthe gas may eddy, so as to prevent its reaching the base-pin.

The gas-collar is a hollow cylinder of noncorrosive metal, or may be of plated metal, of such construction and dimensions as to fit snugly upon the forward shoulder of the basepin, the rear shoulder of the collar being of such circumference as to tit snugly in the recess M. lt is therefore obvious that, when the 'collar is inthe said recess, the entrance of smoke and gas into the cavity L, and the consequent fouling of the base-pin, will be eiiectually prevented.

The gas-collar is constructed as aforesaid, and is provided at its front end with the aunular shoulder a, having a slightly backward bevel, and at its rear end with the annular shoulder b, the surface of which is parallel withl the axis of the collar, and somewhat lessf iii-length than the recess Min the cylinder, thus leaving a space in front of the shoulder b even when the gas-collar is thrown forward by thc discharge.

The gas-collar, though fitting snugly upon the base-pin, as aforesaid, 'and ulsointothe recess M, is made so as to slide readily upon 2- Macao a the base-pin, and is rotated by or rotates with the cylinder, and when thrown forward by the discharge of the arm it closes the recess in front of it, entirely covering and protecting the forward shoulder'of -the base-pin,.an.d yet leaves an annular space in the recess M in front of the shoulder b, within which the smoke l and gas can eddy, and thus escape. Thus the cylinder is free to revolve, and yet the gascollar shields its axis-lthe base-pin-from vthe corrosive and fouling action of gas and smoke, and should any fouling material enter the cavity L it will be retained in the recess of the base-pin, and cause no obstructionvto the revolving of the cylinder.

What I claire as my invention, and desire l' l to secure by etters Patent, is

L The ejecor-'stud A,having squared shoulders,so that it can `be removed by means of a wrench, substantiallyas lset forth.

2. A movable gas-collar, having shoulders described, I have-hereunto set ,my hand this 8th day of March, 1877.

GEoncEw. soHoFmLD.

Witnesses: l I

ALBERT Tmrm, s C.` J. Oooxs. 

